Expression of modified xynA gene fragments from Bacillus subtilis BE-91

文献类型： 外文期刊

第一作者： Liu, Zhengchu

作者： Liu, Zhengchu;Duan, Shenwen;Zheng, Ke;Feng, Xiangyuan;Xu, Junfei;Zhang, Juzuo

作者机构：

关键词： Expression;Modified xynA gene fragments;Bacillus subtilis BE-91

期刊名称：ANNALS OF MICROBIOLOGY （ 影响因子：2.112； 五年影响因子：2.151 ）

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收录情况： SCI

摘要： Expression of modified xynA gene fragments in Escherichia coli BL21 was studied, using the complete xynA gene from Bacillus subtilis BE-91 as the positive control. The technical workflow consisted of the following steps: (1) predicting protein structures relative to the xynA gene; (2) designing primers for modifiers; (3) amplifying the modifiers; (4) integrating the modifiers with the pET-28a(+) vector; (5) transferring the recombinant plasmids into E. coli BL21; (6) evaluating and analyzing the expression of modified cells. The results were: (1) the xynA gene from BE-91 with the untranslated region deleted on both ends was able to promote XynA activity by 28.9 %; (2) deletion of the 1- to 16-amino acid (AA) coding sequence in the open reading frame on the 5′-end, deletion of the 209- to 213-AA fragment on the 3′-end and deletion of the 20 AA on both ends could promote XynA activity by 27.2, 27.7 and 24.0 %,respectively; (3) deletion of the 1- to 29-AA fragment on the 5′-end and deletion of the 197- to 213-AA fragment on the 3′-end could reduce XynA activity dramatically by 95.6 and 74.8 %, respectively; (4) inactivation factors of XynA would be either the first β-fold and the hydrophilic structure domain or the last two α-screws and the seventeenth turn region. The results mean that any deletion in the catalytic domain would lead to a decline or inactivation in XynA activity while the deletion of any sequence outside the catalytic domain could effectively promote XynA activity, as such sequences are unnecessary for XynA function.

分类号： Q93

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